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24 April 2024 |
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Universal mechanical exfoliation of large-area 2D crystals | | Yuan Huang
; Yu-Hao Pan
; Rong Yang
; Li-Hong Bao
; Lei Meng
; Hai-Lan Luo
; Yong-Qing Cai
; Guo-Dong Liu
; Wen-Juan Zhao
; Zhang Zhou
; Liang-Mei Wu
; Zhi-Li Zhu
; Ming Huang
; Li-Wei Liu
; Lei Liu
; Peng Cheng
; Ke-Hui Wu
; Shi-Bing Tian
; Chang-Zhi Gu
; You-Guo Shi
; Yan-Feng Guo
; Zhi Gang Cheng
; Jiang-Ping Hu
; Lin Zhao
; Eli Sutter
; Peter Sutter
; Ye-Liang Wang
; Wei Ji
; Xing-Jiang Zhou
; Hong-Jun Gao
; | | Date: |
12 Feb 2020 | | Abstract: | Two-dimensional (2D) materials provide extraordinary opportunities for
exploring phenomena arising in atomically thin crystals. Beginning with the
first isolation of graphene, mechanical exfoliation has been a key to provide
high-quality 2D materials but despite improvements it is still limited in
yield, lateral size and contamination. Here we introduce a contamination-free,
one-step and universal Au-assisted mechanical exfoliation method and
demonstrate its effectiveness by isolating 40 types of single-crystalline
monolayers, including elemental 2D crystals, metal-dichalcogenides, magnets and
superconductors. Most of them are of millimeter-size and high-quality, as shown
by transfer-free measurements of electron microscopy, photo spectroscopies and
electrical transport. Large suspended 2D crystals and heterojunctions were also
prepared with high-yield. Enhanced adhesion between the crystals and the
substrates enables such efficient exfoliation, for which we identify a common
rule that underpins a universal route for producing large-area monolayers and
thus supports studies of fundamental properties and potential application of 2D
materials. | | Source: | arXiv, 2002.5025 | | Services: | Forum | Review | PDF | Favorites | |
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